Reserve for Future Policy Benefits and Contractholder Funds - Schedule of revenue and interest (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	$ 496	$ 538
Interest expense	29	20
Accident and health insurance
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	446	494
Interest expense	22	13
Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Revenues	50	44
Interest expense	$ 7	$ 7